Preparation method of coated flaky carbonyl iron powder

A carbonyl iron powder and coating technology, which is applied in the field of preparing coated flake carbonyl iron powder, can solve the problems of large complex permittivity, poor spectral characteristics, high density, poor low frequency absorption performance and the like

Active Publication Date: 2020-07-07
LUOYANG INST OF CUTTING EDGE TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbonyl iron powder is a relatively common magnetic absorbing material, but its defects such as high density, large complex permittivity, poor spectral characteristics, and poor low-frequency absorption performance limit the application of carbonyl iron powder in the 1-4GHz frequency band. Generally, it is necessary to adjust the ratio of complex permittivity and complex permeability of carbonyl iron powder through surface modification to improve its impedance matching characteristics and thus improve its low-frequency absorbing performance.

Method used

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  • Preparation method of coated flaky carbonyl iron powder

Examples

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Effect test

Embodiment 1

[0023] A method for preparing a low-frequency, light, high-efficiency, high-performance powder, comprising the following steps:

[0024]Firstly, sodium hydroxide was dissolved in deionized water to prepare an aqueous solution of sodium hydroxide with a mass fraction of 10%. Add 400g of calcium stearate, 2L of sodium hydroxide aqueous solution, 8kg of carbonyl iron powder, and 20L of ethanol in the stirring mill for ball milling, set the ball mill speed to 200r / min, and the ball milling time is 10h; wherein zirconium beads and carbonyl iron The ball-to-material ratio of the powder is 8:1. The zirconium beads are composed of large, medium and small zirconium beads with diameters of 12mm, 8mm and 3mm. The masses of the three types of zirconium beads are 3kg, 21kg and 40kg. The total weight is 64kg. After ball milling, the slurry is taken out, washed 4 times, and heated and dried at 50°C for 6 hours to obtain flaky carbonyl iron powder with hydroxyl groups on the surface and high ...

Embodiment 2

[0027] A method for preparing a low-frequency, light, high-efficiency, high-performance powder, comprising the following steps:

[0028] Firstly, sodium hydroxide was dissolved in deionized water to prepare an aqueous sodium hydroxide solution with a mass fraction of 15% for later use. Add 800g of calcium stearate, 2L of sodium hydroxide aqueous solution, 8kg of carbonyl iron powder, and 20L of absolute ethanol into the stirring mill for ball milling, set the ball mill speed to 250r / min, and the ball milling time is 10h; The ball-to-material ratio of the powder is 8:1. The zirconium beads are composed of large, medium and small zirconium beads with diameters of 12mm, 8mm and 3mm. The masses of the three types of zirconium beads are 3kg, 21kg and 40kg. The total weight is 64kg. After ball milling, the slurry is taken out, washed 4 times, and heated and dried at 50°C for 6 hours to obtain flaky carbonyl iron powder with hydroxyl groups on the surface and high surface activity. ...

Embodiment 3

[0031] A method for preparing a low-frequency, light, high-efficiency, high-performance powder, comprising the following steps:

[0032] Firstly, sodium hydroxide was dissolved in deionized water to prepare an aqueous solution of sodium hydroxide with a mass fraction of 20%. Add 1.2kg of calcium stearate, 2L of sodium hydroxide aqueous solution, 8kg of carbonyl iron powder, and 20L of ethanol in the stirring mill for ball milling, set the ball mill speed to 350r / min, and the ball milling time is 10h; wherein the zirconium beads and carbonyl The ball-to-material ratio of the iron powder is 12:1, and the zirconium beads are composed of large, medium, and small zirconium beads with diameters of 12mm, 8mm, and 3mm. The masses of the three types of zirconium beads are 5kg, 31kg, and 60kg. The total weight was 96kg. After ball milling, the slurry was taken out, washed 4 times, and heated and dried at 50°C for 6 hours to obtain flaky carbonyl iron powder with hydroxyl groups on the s...

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Abstract

The invention discloses a preparation method of coated flaky carbonyl iron powder. The preparation method comprises the following steps of: (1) preparing an aqueous solution of sodium hydroxide; (2) mixing and ball-milling the aqueous solution of sodium hydroxide, stearate, carbonyl iron powder and absolute ethyl alcohol; (3) cleaning the ball-milled slurry, and carrying out vacuum drying to obtain flaky carbonyl iron powder containing hydroxyl functional groups; (4) mixing the flaky carbonyl iron powder, deionized water and absolute ethyl alcohol, adjusting the pH value of the solution to 6-7with weak acid, and then adding a silane coupling agent and a titanate coupling agent for secondary ball milling; and (5) cleaning the slurry subjected to secondary ball milling, and carrying out vacuum drying to obtain the coated flaky carbonyl iron powder. According to the invention, two ball milling processes are adopted to prepare the flaky carbonyl iron powder which is low in density and good in impedance matching performance and is coated with an organic thin film layer on the surface, the absorption peak value of the carbonyl iron powder is lower than -29.7 dB within the frequency bandrange of 2.2 GHz to 2.9 GHz, the bandwidth of -10 dB reaches 1.72 GHz, and the carbonyl iron powder has the broadband efficient electromagnetic wave absorption characteristic.

Description

【Technical field】 [0001] The invention relates to the field of wave-absorbing materials, in particular to a preparation method of coated flake carbonyl iron powder. 【Background technique】 [0002] With the continuous development of information technology, the absorption of low-frequency radar and the transmission of electronic signals have attracted more and more attention. In recent years, my country's research on absorbing materials has made great progress, such as A great breakthrough has been made in the research of the technology, but the thin wave-absorbing material used in the 1-4GHz frequency band has just started. [0003] The magnetic absorbing material is mainly ferromagnetic resonance absorption, which uses eddy current loss, hysteresis loss, and residual loss mechanism to absorb electromagnetic waves. Carbonyl iron powder is a relatively common magnetic absorbing material, but its defects such as high density, large complex permittivity, poor spectral characteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/16H05K9/00
CPCC01G49/16H05K9/0081C01P2004/20C01P2006/10
Inventor 刘若鹏赵治亚刘志礼黄赤张运湘王佳佳
Owner LUOYANG INST OF CUTTING EDGE TECH
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